Hand foot mouth disease. Appetite loss!

Son started having fever from Sunday 10pm onwards. We gave calpol at appropriate interval 5ml each time. Fortunately tuesday morning onwards there was no fever and we stopped calpol as well. We noticed some sores near the uvula and went to doctor. There were 1-2 rashes on the earlobe and veryfew on the wrist as well. Paediatrician told this is hfmd and it is self limiting. Also gave calpol as sis and atarax(5ml 3 times). Problem is that fever returned again on Wednesday evening and as of today Friday 2:37 am fever keeps coming back. Calpol we are giving as sos only, i.e., when thermometer forehead temperature crosses 99.5. we noticed slight changes in the mouth and ear sores. Apart from that 2-3 sores developed on the right leg sole, 1 on the back side near shoulder, but all seem pretty flat and not whitish like pimple or too much watery. Please suggest if we should be worried. Paediatrician adviced to wait for a couple of days more. Son is 17 kg in weight. There is some appetite loss